Full description

Virus:	TR/Obisty.A
Date discovered:	19/12/2012
Type:	Trojan
In the wild:	No
Reported Infections:	Medium
Distribution Potential:	Low
Damage Potential:	Medium
Static file:	Yes
File size:	148.992 Bytes
MD5 checksum:	89FA070B12AEE94C97F15AFBC8404E00
VDF version:	7.11.54.86 - Wednesday, December 19, 2012
IVDF version:	7.11.54.86 - Wednesday, December 19, 2012

General Method of propagation:
   • By visiting infected websites

Similar detection:
   • JS/Redirector.SB
   • EXP/Pidief.zar

Platforms / OS:
   • Windows 2000
   • Windows XP
   • Windows 2003
   • Windows Vista
   • Windows Server 2008
   • Windows 7

Side effects:
   • Third party control
   • Registry modification
   • Steals information

Files It copies itself to the following location:
• %APPDATA%\KB%eight-digit random character string%.exe

The following file is created:

– %TEMPDIR%\exp3.tmp.bat Furthermore it gets executed after it was fully created. This batch file is used to delete a file.

Registry The following registry key is added in order to run the process after reboot:

– HKCU\Software\Microsoft\Windows\CurrentVersion\Run
• %APPDATA%\KB%eight-digit random character string% .exe

Backdoor Contact server:
One of the following:
   • http://84.22.100.108:8080/%random character string%/%random character string%/%random character string%
   • http://182.237.17.180:8080/%random character string%/%random character string%/%random character string%
   • http://123.49.61.59:8080/%random character string%/%random character string%/%random character string%
   • http://204.15.30.202:8080/%random character string%/%random character string%/%random character string%
   • http://64.76.19.236:8080/%random character string%/%random character string%/%random character string%
   • http://59.90.221.6:8080/%random character string%/%random character string%/%random character string%
   • http://210.56.23.100:8080/%random character string%/%random character string%/%random character string%
   • http://94.73.129.120:8080/%random character string%/%random character string%/%random character string%
   • http://174.143.174.136:8080/%random character string%/%random character string%/%random character string%
   • http://203.217.147.52:8080/%random character string%/%random character string%/%random character string%
   • http://74.207.237.170:8080/%random character string%/%random character string%/%random character string%
   • http://23.29.73.220:8080/%random character string%/%random character string%/%random character string%
   • http://69.64.89.82:8080/%random character string%/%random character string%/%random character string%
   • http://74.63.229.10:8080/%random character string%/%random character string%/%random character string%
   • http://74.86.113.66:8080/%random character string%/%random character string%/%random character string%
   • http://174.121.188.156:8080/%random character string%/%random character string%/%random character string%
   • http://50.22.94.96:8080/%random character string%/%random character string%/%random character string%
   • http://173.203.102.204:8080/%random character string%/%random character string%/%random character string%
   • http://74.117.107.25:8080/%random character string%/%random character string%/%random character string%
   • http://174.142.68.239:8080/%random character string%/%random character string%/%random character string%
   • http://188.212.156.170:8080/%random character string%/%random character string%/%random character string%
   • http://188.120.226.30:8080/%random character string%/%random character string%/%random character string%
   • http://78.28.120.32:8080/%random character string%/%random character string%/%random character string%
   • http://217.65.100.41:8080/%random character string%/%random character string%/%random character string%
   • http://81.93.250.157:8080/%random character string%/%random character string%/%random character string%
   • http://188.40.109.204:8080/%random character string%/%random character string%/%random character string%

As a result it may send information and remote control could be provided. This is done via the HTTP POST method using a PHP script.

Injection – It injects itself as a thread into processes.

It is injected into all processes.

File details Programming language:
The malware program was written in MS Visual C++.

Runtime packer:
In order to aggravate detection and reduce size of the file it is packed with a runtime packer.

설명 삽입자 Liviu Serban 2012년 12월 19일 수요일
설명 업데이트 Andrei Gherman 2012년 12월 19일 수요일

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